I believe there are two aspects to it: the one thing is that you found something for yourself that makes you feel good, great, happy, excited, etc. Sometimes people find out accidentally. In your case this could have been for example that you were out somewhere and had to pee urgently but no bathroom was avaliable so you had to do it behind a bush or so and you found that it made you very excited. So, now you want to have this over and over again for the sake of the pleasure and feeling.

Now, the question of course is, why this particular behavior gives you so much pleasure and here a therapist might be able to help you to find out what the deeper meaning is. But the other side of the medal is why you even need something (whatever it is) to make you excited and what might be wrong in your current life situation that makes you rather unhappy.

I don't think this will automatically lead to psychosis, but it would be very recommendable to seek help from a therapist.

If you don't have access to that, there are internet forums for about anything out there that you could think about. So, I'm sure you will find peers online that you can talk to and exchange thouhgts and you can maybe find out that way yourself what it is actually about.